When the watch is removed, the document representing the watch in the .watches
index is gone and it will never be run again.

Please note that deleting a watch does not delete any watch execution records
related to this watch from the watch history.

Deleting a watch must be done via this API only. Do not delete the
watch directly from the .watches index using the Elasticsearch
DELETE Document API. When Elasticsearch security features are enabled, make
sure no write privileges are granted to anyone over the .watches
index.